Device that has means for mechanically balancing the vertical movements that take place, the movement of extension and retraction of the mobile portion of the column and the movement of the telescopic arm along the mobile portion of the column, it comprises : a chassis, a telescopic column which comprises a lower fixed portion rotating with respect to a vertical axis, and at least one upper mobile portion, a telescopic arm that moves along the vertical column and that supports an x-ray emitter at its end, wherein the telescopic arm-head assembly can be moved from the lower position of the mobile column in its retracted position to the upper position of the mobile column in its extended position, and also in that all the movements of the column are manual and have a mechanical balancing mechanism which comprises a first mechanism, and a second balancing mechanism.
